> > The O_DIRECT flag has been added to open(2) and fcntl(2). Specifying
this
> > flag for open files will attempt to minimize the cache effects of
reading
> > and writing.
>
> I wonder if using this for WAL would be good.
Not before the code is not optimized to write more than the current 8k
to
the WAL at a time.
(The killer currently are larger transactions that produce approx more
than 64k WAL, (try the open_datasync setting with "copy from"))
Andreas